نبذة مختصرة : International audience ; This study evaluated the effectiveness of three plant species (Panicum maximum, Echinochloa pyramidalis, and Typha domingensis) in enhancing the removal of salinity, nitrogen, phosphorus, and chemical oxygen demand during sludge treatment within sludge treatment reed beds (STRBs). The experimental setup consisted of 1 m³ tanks filled with layers of sand and gravel, simulating a reed bed configuration. A total of twelve pilot-scale units were used, with each plant species tested in triplicate, while three units served as non-planted (control) groups. Over a 6-month period, the units received weekly loadings of faecal sludge sourced from a site in southern Benin. Weekly sampling was conducted to evaluate the removal efficiency of the assessed parameters. The results indicated the superior efficacy of STRBs compared to control beds, with this enhancement attributed to the presence of vegetation. At a loading rate of 300 kg TS/m²/year, the system demonstrated robust performance. Specifically, P. maximum and E. pyramidalis beds showed the highest removal rates (Salinity: 97.95%, PO₄ ³⁻ : 97.75%, TP: 98.08%, NH₄⁺: 98.68%, NO₃⁻: 98.71%, TKN: 99.53%, TSS: 99.98%, COD: 99.94%). Additionally, the drying rates of E. pyramidalis and P. maximum beds (49.5% and 48.5%, respectively) exceeded those of T. domingensis beds (34.7%). These findings underscore the potential of P. maximum, a newly tested species, for application in STRBs and highlight the need for further research dedicated to this species.
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